title: Secondary analysis of electronic databases: potentials and limitations.
authors.forename: S
authors.initials: S
authors.lastname: Asghari
authors.forename: M
authors.initials: M
authors.lastname: Mahdavian
mesh_terms: D003924:Diabetes Mellitus, Type 2 / Q000150:complications*; D003930:Diabetic Retinopathy / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male